Just Not Good Enough

Things were going fairly well for about twenty minutes, until Sarah suddenly closed her book. "What's wrong?" Jon asked. "Well ... I thought you wearing a skirt would make me more comfortable. But it's just not enough." Jon nearly winced, wondering what Sarah wanted *this* time. It was already bad enough that he was wearing the thong panties and miniskirt. "Jon, I think it would make me feel better if you ..."